BB-UN300-K Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS For Chain Case

The Shimano BB-UN300-K Bottom Bracket is designed for chain cases. It features a 68mm shell width and a 122.5mm square taper JIS spindle. This bottom bracket fits JIS square-taper cranksets. The crankarm fixing bolts are sold separately. It has a hollow spindle for better performance. The color is black, which gives it a sleek look. With an English BB/Frame Interface and a 1.37 Bottom Bracket Shell I.D., it's a great choice for your bike.

Using this Shimano BB-UN300-K bottom bracket is easy. First, make sure your bike's bottom bracket shell matches the specifications - it should have an English interface, a 1.37 inner diameter, and a 68mm width. Install the bottom bracket into the shell carefully. When attaching the cranksets, remember that the crankarm fixing bolts are sold separately, so you'll need to get those and use them to secure the cranks. As for maintenance, regularly check the spindle for any signs of wear or damage. Keep it clean by wiping it down with a dry cloth after rides, especially if you've been in wet or muddy conditions. This will help keep your bottom bracket working smoothly and extend its lifespan.